Which gun is this?

[John McGillivray]

When I was in 2 Field , there was a sgt who had served in 2nd Medium Regt in the early sixties. They were equipped with towed 155mm howitzers and used 5 ton trucks as gun tractors. 2 Med was reduced to nil strength in 1965.
There is a 155 howitzer along with a Lynx in front of the Cote-des-Neiges armoury.